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is a significant concern for physicians. Central7 D0 j2 {$ g( H% J
precocious puberty (CPP), which is mediated' e j( R$ Q' O6 |! t
through the hypothalamic pituitary gonadal axis, has9 V% u) [6 ]' U S8 I( m
a higher incidence of organic central nervous system# q4 {% m; H/ v( y
lesions in boys.1,2 Virilization in boys, as manifested
/ M j9 B6 M) O/ a" @4 L: Z' I) Qby enlargement of the penis, development of pubic
! [; e }8 F; k) p2 D9 Ahair, and facial acne without enlargement of testi-4 K6 w6 p6 e2 b4 r: _( A/ V
cles, suggests peripheral or pseudopuberty.1-3 We$ p" ^+ ?" ~' `2 N+ I
report a 16-month-old boy who presented with the
9 b% r5 Y8 T" n# O& u8 B3 n6 benlargement of the phallus and pubic hair develop-
; Q4 E# k' g2 R0 |5 Pment without testicular enlargement, which was due! N+ L- D7 ]9 T9 q
to the unintentional exposure to androgen gel used by
. ]" i. Z1 l; V; b# Qthe father. The family initially concealed this infor-
) ~2 e+ X( ]3 r j# omation, resulting in an extensive work-up for this
" K1 G% A" z$ g$ X# L% d. Wchild. Given the widespread and easy availability of
& O3 T' m4 R7 V7 y( Q; \testosterone gel and cream, we believe this is proba-- i- a/ a* P$ t( k, L4 f: f+ m
bly more common than the rare case report in the
2 X: c- }: _: ]8 H5 t- Cliterature.4
' s" x, ?% u' ?- D4 y% H2 WPatient Report
+ h. Z* e0 Z, Z4 u: ]A 16-month-old white child was referred to the
2 t Y" W( l7 O! gendocrine clinic by his pediatrician with the concern
* [1 x' S, q) L. w: ?of early sexual development. His mother noticed# d. s3 Z8 K0 [, P
light colored pubic hair development when he was, v# n: B) z/ E
From the 1Division of Pediatric Endocrinology, 2University of5 `2 c/ d a: Y) {% O9 Q
South Alabama Medical Center, Mobile, Alabama.
# Q, [- G x9 p, X$ f2 SAddress correspondence to: Samar K. Bhowmick, MD, FACE,8 C0 z3 u" [. h* R2 o' X
Professor of Pediatrics, University of South Alabama, College of3 E2 U3 a# ~- N+ J. {1 \4 B, }
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
# U: W- j# ^4 Ke-mail: [email protected].
! x1 L) y/ a O' Yabout 6 to 7 months old, which progressively became8 x: D& g* G" f( v3 `1 P
darker. She was also concerned about the enlarge-
4 A5 L& P- j5 H, @( W' _6 j6 Lment of his penis and frequent erections. The child6 W/ u$ \9 y9 H- f& w8 q
was the product of a full-term normal delivery, with% d# r; @- i: R) A3 I6 B$ [
a birth weight of 7 lb 14 oz, and birth length of: e, Q5 p% u% @2 m
20 inches. He was breast-fed throughout the first year% D2 {% c0 W9 s# b8 C0 K/ G
of life and was still receiving breast milk along with5 P2 m+ c6 f0 s
solid food. He had no hospitalizations or surgery,1 I5 P% r6 J4 s( p4 G; F+ f
and his psychosocial and psychomotor development
, r% I- l1 s! K0 ?" y1 iwas age appropriate.
3 Q M0 A& h; d$ ]6 S- @The family history was remarkable for the father,
/ ]8 c& h! n; _& o twho was diagnosed with hypothyroidism at age 16,3 G! o% c# Z! H9 b0 t3 |! q
which was treated with thyroxine. The father’s- z8 c1 y9 h; t, C4 e
height was 6 feet, and he went through a somewhat
7 U# u6 v* U% _: S$ {8 P4 Rearly puberty and had stopped growing by age 14.
+ N! W" v$ I3 ?3 x5 K' b( eThe father denied taking any other medication. The F* Q; O( ~( d8 \
child’s mother was in good health. Her menarche
" K/ C9 Z3 e [2 P4 _5 h Lwas at 11 years of age, and her height was at 5 feet9 D6 f; x3 T8 i K
5 inches. There was no other family history of pre-- _! q% C" g( L/ c' Z/ e$ N% l+ R
cocious sexual development in the first-degree rela-) g/ a: R! @, B- A* [# t) [% c' k
tives. There were no siblings.
: d% H7 k) a3 w- F% K m+ y6 JPhysical Examination
) [+ c6 }7 D0 U' T. ]' d' l# rThe physical examination revealed a very active, I# Z: \4 l7 Z; y! [- S8 c
playful, and healthy boy. The vital signs documented* _2 L5 x' H: F/ N, R) A
a blood pressure of 85/50 mm Hg, his length was# @" R; ^7 e0 U5 M
90 cm (>97th percentile), and his weight was 14.4 kg- |+ v5 r% o- {) i
(also >97th percentile). The observed yearly growth" J$ t( ~' i2 }$ v+ Q
velocity was 30 cm (12 inches). The examination of
, p4 a8 }9 E' @3 ^# e3 |& B, Uthe neck revealed no thyroid enlargement.' P* J, H, L! o1 T
The genitourinary examination was remarkable for% i* {/ L/ V( h) ?
enlargement of the penis, with a stretched length of
! P+ d/ y' K! u" s2 _8 cm and a width of 2 cm. The glans penis was very well
J! g- K/ F- ~ z9 qdeveloped. The pubic hair was Tanner II, mostly around
- w* e7 R1 ~: V) L; I- C540. Z( X+ @/ c. {7 \
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from( k. z; f* Y& [" x- N
the base of the phallus and was dark and curled. The0 o7 }& n3 A- r5 m
testicular volume was prepubertal at 2 mL each.
4 ?: D) F. j, ~2 r! L% RThe skin was moist and smooth and somewhat1 T9 [) Q6 G. k
oily. No axillary hair was noted. There were no
1 v0 T# `1 w, Fabnormal skin pigmentations or café-au-lait spots.
6 V) [& H5 J7 e& a. b6 I# _Neurologic evaluation showed deep tendon reflex 2+
, M6 n2 F1 |% nbilateral and symmetrical. There was no suggestion
; e2 w0 z0 _, _$ m% z% p, P/ N; _3 d( ^of papilledema.
# Y9 X/ _7 s R# W qLaboratory Evaluation' }! a9 I" ?; G- ]* z! [
The bone age was consistent with 28 months by
+ N4 y8 n) Y5 |7 k; m! Lusing the standard of Greulich and Pyle at a chrono-# i1 D6 x, j6 L$ F% \# d3 j$ J' X7 c2 o
logic age of 16 months (advanced).5 Chromosomal
: ], Z: F2 f {- hkaryotype was 46XY. The thyroid function test/ v- O* m7 B3 Q0 V5 G& i$ b$ ^
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
- v0 a7 |" o$ Q7 T3 M- S% ^lating hormone level was 1.3 µIU/mL (both normal).
& D5 w/ v/ q$ L+ h! V) }" ^The concentrations of serum electrolytes, blood1 _1 M% R) y- `
urea nitrogen, creatinine, and calcium all were8 x( V: P8 i' A2 W
within normal range for his age. The concentration
, j B% r5 [, [ G; p% d7 }of serum 17-hydroxyprogesterone was 16 ng/dL! w [7 E5 c' a
(normal, 3 to 90 ng/dL), androstenedione was 20
' Z L' K& @, O+ d: @3 kng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-! W! ]: H; w6 o" l
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
n- I6 a$ @3 I0 G0 @) m) }desoxycorticosterone was 4.3 ng/dL (normal, 7 to, x) e. z0 @( q9 `! h; ~& }1 [* x
49ng/dL), 11-desoxycortisol (specific compound S)' u" x/ w9 j. |: w% @2 [0 I
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
8 N$ f% e; z7 p, J2 [tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
" C, q6 l/ B) G. l' ]( _testosterone was 60 ng/dL (normal <3 to 10 ng/dL),8 C, `, {0 }7 M+ f8 f, C
and β-human chorionic gonadotropin was less than
6 [; |3 ]( ?+ b3 H7 [8 s8 h+ k* B5 mIU/mL (normal <5 mIU/mL). Serum follicular
( I2 f3 P" I7 r9 w$ Y2 g+ {stimulating hormone and leuteinizing hormone8 ?( x) k; T- f" }8 z. L
concentrations were less than 0.05 mIU/mL
4 k4 [, x2 n0 v8 E5 V(prepubertal).7 ^& g, v' [4 n. W- Q0 y
The parents were notified about the laboratory
. W' N/ d4 _4 j" \results and were informed that all of the tests were
1 ]/ n7 n* z- F9 Fnormal except the testosterone level was high. The
0 s, r, t0 w5 e; V/ Ffollow-up visit was arranged within a few weeks to
- g6 H$ W4 Z/ R6 c8 s; `* vobtain testicular and abdominal sonograms; how-2 h- X: R+ }5 ?, F& J4 C$ F
ever, the family did not return for 4 months.
, C0 a: ^) n- S W' vPhysical examination at this time revealed that the: Q% S R2 p( s
child had grown 2.5 cm in 4 months and had gained8 a9 [3 W/ u( s7 A" K$ T" ?6 C
2 kg of weight. Physical examination remained% F/ X$ T* }7 x7 d! \* C
unchanged. Surprisingly, the pubic hair almost com- Q; j9 m' u& V+ E5 c/ {
pletely disappeared except for a few vellous hairs at3 M0 k/ A! d0 @; M! s* h
the base of the phallus. Testicular volume was still 2, X$ V7 @$ x! x: {: N
mL, and the size of the penis remained unchanged.
4 z: U" Y+ z( N0 R9 gThe mother also said that the boy was no longer hav-
; n1 {; D, V: `6 King frequent erections.
% i0 \. d: Z4 LBoth parents were again questioned about use of
9 L# n0 w$ T4 n" J2 C# r2 Uany ointment/creams that they may have applied to/ y# E' d5 ?# I% V
the child’s skin. This time the father admitted the
8 H% ~& Q* N+ ^1 E4 X: eTopical Testosterone Exposure / Bhowmick et al 541
( r* w+ f- T1 s* Duse of testosterone gel twice daily that he was apply-
1 \% c% t( c2 d8 V7 F" G: Q0 q# Ling over his own shoulders, chest, and back area for- b1 C8 O* x6 i: p& K2 {( `
a year. The father also revealed he was embarrassed: ~! d, n) }- u& ^2 a+ K1 t
to disclose that he was using a testosterone gel pre-
4 B( J9 E3 J* \, p9 iscribed by his family physician for decreased libido
, R& u3 r6 W; \1 j \secondary to depression.
; }2 O) G1 j7 R, g2 d, rThe child slept in the same bed with parents.
% R [4 ^5 s$ v/ q) ^The father would hug the baby and hold him on his/ n% D! I" K% c2 J! ]5 r
chest for a considerable period of time, causing sig-
+ X* d, ]1 h3 x4 h4 J6 Znificant bare skin contact between baby and father.
9 A$ |0 ]* q9 d+ CThe father also admitted that after the phone call,
( q. a# i [/ D4 V3 c: y8 T6 f/ O0 U& Bwhen he learned the testosterone level in the baby
; s8 A7 Q+ B6 o! e3 J9 H2 Rwas high, he then read the product information
1 z) k% x1 ~' m( Npacket and concluded that it was most likely the rea-
% G5 I* x! Y. v# G' `2 F1 Nson for the child’s virilization. At that time, they
Q7 v4 q0 l" S* M! T- }$ vdecided to put the baby in a separate bed, and the7 T% `, w" K7 c/ c& C
father was not hugging him with bare skin and had+ o. C) c9 ^9 h V
been using protective clothing. A repeat testosterone; U+ x9 r) L1 g: y
test was ordered, but the family did not go to the5 {% P* ~" t, o2 Z( a) k
laboratory to obtain the test." h, f3 o8 j& g R0 M
Discussion
^7 Q" K( T9 M) M1 }" ePrecocious puberty in boys is defined as secondary
& L. b( I9 l! u# ~sexual development before 9 years of age.1,40 I) `) G8 S; Y5 S- u
Precocious puberty is termed as central (true) when$ s! ~ t* O+ h4 G4 o
it is caused by the premature activation of hypo-& c8 g' _6 H a* S6 y9 z( v0 O
thalamic pituitary gonadal axis. CPP is more com-: g' b# q" d0 F E0 ~+ P
mon in girls than in boys.1,3 Most boys with CPP
8 H! O$ C) c: i% C' C& H7 ~may have a central nervous system lesion that is O* D( s: ^7 e$ x* ~$ B
responsible for the early activation of the hypothal-
, f5 ?1 w t5 C9 P; kamic pituitary gonadal axis.1-3 Thus, greater empha-
7 V1 w/ y6 v( v* N1 n" t* rsis has been given to neuroradiologic imaging in ~+ A9 `$ T. p4 s0 Z
boys with precocious puberty. In addition to viril-
: @4 N; u, c6 a- v5 _! D) mization, the clinical hallmark of CPP is the symmet-
: h& {/ K* z& ~3 Orical testicular growth secondary to stimulation by
1 `2 {$ E" }+ c9 R2 Fgonadotropins.1,3& c* N% {# h! x
Gonadotropin-independent peripheral preco-
- m3 B+ q% J. |; Y5 ocious puberty in boys also results from inappropriate9 ?4 W& Y9 [ l# U3 d& l: |4 @
androgenic stimulation from either endogenous or ] r# s1 _/ g5 F Z- j( H1 f
exogenous sources, nonpituitary gonadotropin stim-, _5 w3 i, k0 u1 c( ^% ]
ulation, and rare activating mutations.3 Virilizing- _# R3 W& B3 `# B: v
congenital adrenal hyperplasia producing excessive
2 Z/ T! x) f7 B8 T7 yadrenal androgens is a common cause of precocious
) g' B e# o/ k& S% @8 M; M; Ipuberty in boys.3,44 ^9 p* G9 R' d7 k
The most common form of congenital adrenal
1 z% ^* e: W$ _7 c5 x, j* yhyperplasia is the 21-hydroxylase enzyme deficiency.
6 O' a Y6 ` C% z8 vThe 11-β hydroxylase deficiency may also result in7 F+ t, |1 O( a' ?# v: c7 u% N
excessive adrenal androgen production, and rarely,
! `8 N' @" T9 }3 r# Wan adrenal tumor may also cause adrenal androgen3 I7 f, p1 {$ |2 o
excess.1,3
3 c% |# Z/ g$ @: L( v2 Hat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from8 w' t& Y5 `' \2 B8 Q5 ?/ X% V
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
[3 `) ^; C) [+ e+ y- l, y5 \$ OA unique entity of male-limited gonadotropin-
% F, G8 t. h! G" Y" {! x& Rindependent precocious puberty, which is also known
2 ~5 x# }! w1 {: \9 y3 A/ aas testotoxicosis, may cause precocious puberty at a
: o0 B& J% j* \ y. p. hvery young age. The physical findings in these boys4 C' I" F# K \0 m3 U8 \$ w. b' m! s
with this disorder are full pubertal development,! s# s6 t3 `% g
including bilateral testicular growth, similar to boys
1 k" h; w$ w* rwith CPP. The gonadotropin levels in this disorder
) ]. M+ v. a5 m9 c/ mare suppressed to prepubertal levels and do not show: W: s* T! b! I0 H
pubertal response of gonadotropin after gonadotropin-5 k3 ]$ B4 c% J# }. M- j! i- S
releasing hormone stimulation. This is a sex-linked
+ H7 \1 i6 C8 ]" sautosomal dominant disorder that affects only4 A: o" ]1 G' i3 K$ W; \) o
males; therefore, other male members of the family2 D; j' f/ h8 f j' s
may have similar precocious puberty.3
' B5 ]! L2 o$ q9 U9 EIn our patient, physical examination was incon-8 R1 b9 L/ Y$ k" X4 I p
sistent with true precocious puberty since his testi-* a* b5 m. Y. \9 h3 h/ h
cles were prepubertal in size. However, testotoxicosis! Z5 u2 {- v3 F
was in the differential diagnosis because his father
# e9 i8 e5 ^9 S( istarted puberty somewhat early, and occasionally,# s6 [6 z' t1 z& G& c, Q k
testicular enlargement is not that evident in the
# G# f; @- @# d ]5 D* ?; Mbeginning of this process.1 In the absence of a neg-! K: C% Q) |! [" c& u# n
ative initial history of androgen exposure, our
& e* S. w* E) f, Q2 Bbiggest concern was virilizing adrenal hyperplasia,2 z/ H1 V; p) e0 }" ^0 e& I2 o
either 21-hydroxylase deficiency or 11-β hydroxylase
& \9 q2 x/ ]+ Odeficiency. Those diagnoses were excluded by find-
2 b% T$ q4 q( J Uing the normal level of adrenal steroids., r2 D) I+ R( W% Z, X
The diagnosis of exogenous androgens was strongly& [, P" T& d- Q
suspected in a follow-up visit after 4 months because
# C; M7 u6 Z2 n. R" K- q# Fthe physical examination revealed the complete disap-
) b# N) F3 l1 t+ ppearance of pubic hair, normal growth velocity, and
) I3 h8 r$ J& J Y2 y) Odecreased erections. The father admitted using a testos-: S7 R3 M( l: l7 t, W1 I3 e+ b
terone gel, which he concealed at first visit. He was
]# s# G K0 U3 G$ i5 eusing it rather frequently, twice a day. The Physicians’
; h& \) p$ ^9 L- e; _' ~- \Desk Reference, or package insert of this product, gel or
+ u8 `% K1 \: H2 u7 jcream, cautions about dermal testosterone transfer to
* x4 p* z1 x# q% H0 |unprotected females through direct skin exposure.2 s' v& q! a- G, S) ^3 T( [
Serum testosterone level was found to be 2 times the
s! O5 z: A4 T0 A7 ?baseline value in those females who were exposed to$ f$ y- z, @. ]" i9 W
even 15 minutes of direct skin contact with their male
5 E9 |* D6 i U9 Y5 L! B( Q% zpartners.6 However, when a shirt covered the applica-- M# P2 S) A1 h
tion site, this testosterone transfer was prevented.3 t( N+ X& R2 J
Our patient’s testosterone level was 60 ng/mL,
8 _! V& K6 J% X! s$ k- Owhich was clearly high. Some studies suggest that
$ y" e4 i5 M5 Bdermal conversion of testosterone to dihydrotestos-
' u4 w' H- e( p. M- _2 iterone, which is a more potent metabolite, is more
" O9 W$ e8 b% Z) h1 s5 y0 Dactive in young children exposed to testosterone/ g0 e: L4 K, h! f, N' }
exogenously7; however, we did not measure a dihy-
- u' d" D" \. c2 x9 a9 W7 J7 Hdrotestosterone level in our patient. In addition to
$ S0 h1 a; a7 o- m/ kvirilization, exposure to exogenous testosterone in
; l5 c3 p: a, \- uchildren results in an increase in growth velocity and* c* ~! {; |/ c; e% r7 R
advanced bone age, as seen in our patient.
" s* S0 n2 s# j" pThe long-term effect of androgen exposure during
5 C. P! ^3 f, A* C! p$ T) u+ _early childhood on pubertal development and final
+ B$ [8 D2 F7 T% f U" N" cadult height are not fully known and always remain
0 x- C O3 a* O' Ba concern. Children treated with short-term testos-
0 |1 x$ j2 D& d6 R6 H, I% cterone injection or topical androgen may exhibit some
8 I0 X# X" h3 n5 macceleration of the skeletal maturation; however, after1 q7 U2 ^" t( M- G0 z8 Z/ |
cessation of treatment, the rate of bone maturation
) S+ W1 o: _" E0 m2 T. m" Cdecelerates and gradually returns to normal.8,9+ j3 a$ }! p2 a8 p
There are conflicting reports and controversy- S$ l% E& F- e. V9 {+ N3 S
over the effect of early androgen exposure on adult
3 x: p! d- p" S! X5 B" gpenile length.10,11 Some reports suggest subnormal. i) K3 b4 w. y2 _' N" ~* o9 g9 M
adult penile length, apparently because of downreg-5 H, @5 c: y$ p5 a
ulation of androgen receptor number.10,12 However, N. k' K2 f! D$ e
Sutherland et al13 did not find a correlation between, n! L1 k" a; {. z4 F3 U+ o
childhood testosterone exposure and reduced adult4 u' S8 {1 w4 T
penile length in clinical studies.% ~) W! v0 E1 {7 G, O% i
Nonetheless, we do not believe our patient is
6 m& L' m& D, p, jgoing to experience any of the untoward effects from
% U4 p/ I* G0 ]testosterone exposure as mentioned earlier because
" k1 L ~' G! uthe exposure was not for a prolonged period of time.& M: O- M' @$ ^; x
Although the bone age was advanced at the time of+ _" e$ p) v n
diagnosis, the child had a normal growth velocity at
5 a- q2 ]+ q4 vthe follow-up visit. It is hoped that his final adult
! B8 l5 Q" @1 Cheight will not be affected.: \. d/ q" |2 \) Z& c! O
Although rarely reported, the widespread avail-
. Z- b+ E% k+ E/ `/ ^ability of androgen products in our society may l* k1 u6 p; n( l, ~9 X# c
indeed cause more virilization in male or female) v4 Z* e+ c* a7 D
children than one would realize. Exposure to andro-- S) ~% G3 C" {! A
gen products must be considered and specific ques-8 ?# v" A) Z3 V2 u: @
tioning about the use of a testosterone product or3 J" q. x' k0 Q3 Q5 J" |3 a
gel should be asked of the family members during
2 h! o$ e( g6 w) bthe evaluation of any children who present with vir-7 a& L) b# `: [6 d
ilization or peripheral precocious puberty. The diag-
0 y' f v" s0 }2 H4 c7 s; mnosis can be established by just a few tests and by
* i) h6 k- }+ \; c4 gappropriate history. The inability to obtain such a8 Q Y5 b p, X2 Z! N
history, or failure to ask the specific questions, may) u2 n0 O$ r1 Q
result in extensive, unnecessary, and expensive
2 l$ b8 \- H, L4 }6 [3 kinvestigation. The primary care physician should be/ Z" A. I$ m/ O' G0 x% ]/ `
aware of this fact, because most of these children
9 ]5 o' S. g B, F5 ?% M/ pmay initially present in their practice. The Physicians’! u8 g5 B) V7 \" J0 {$ H5 e3 L, A/ G
Desk Reference and package insert should also put a
& q" o" w. T! |% h- Jwarning about the virilizing effect on a male or2 x0 y% _+ H6 e2 R
female child who might come in contact with some-
- W# l y4 C* s- B; }2 i0 hone using any of these products.; Q" I( _2 ~; h1 u! {6 }
References
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5 }; H' o2 @3 f4 @3 W: @6. Physicians’ Desk Reference. Androgel 1% testosterone,
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2 C6 _) B1 h! n) r* K8 b9 u7. Klugo RC, Cerny JC. Response of micropenis to topical9 N2 r( K& b4 G
testosterone and gonadotropin. J Urol. 1978;119:! C8 G: o/ `$ G+ g& k
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8. Guthrie RD, Smith DW, Graham CB. Testosterone7 X% D/ c, v; ~* w1 ?
treatment for micropenis during early childhood. J Pediatr.6 n4 w: S9 \, X
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